GEN7iB
234
INPUT CARDS
INPUT CARDS
12
Restore range selected by user automatically
As the GEN series system is designed to measure 24 hours a day, 7 days a week, the
automatic range switching has the negative side effect of reducing the sensitivity of
theamplier.Duringtheactualoverload,thechannelisunabletomeasuretheinput
signal. Therefore, there are no extra negative side effects. If the overload disappears
and the system runs unattended, the input range that is selected automatically will not
bethebestmeasurementrange.Therefore,theamplier"remembers";therangethat
the user originally selected and restores this range as soon as regular thermal condi-
tions are restored. A temporary large overload will then only result in input sensitivity
that is adjusted temporarily.
The automatic range adaptation is started due to thermal conditions typically as a
result channel input overload. Therefore, the overload might still be present. If this
is the case the automatic range restore restarts, the thermal increase and leads to
re-trigger the automatic range adaption process and the overload is handled exactly
the same way as before.
If the overload is permanent, the system keeps on automatic ranging to reduce the
dissipated heat. The system then restores the range selected by the user, causing over-
heating again and thereby restarting the automatic ranging process again. This cycle
will repeat forever until the overload condition disappears.
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